Hi J, You have not provided nearly enough information for us to evaluate whether the results should be similar. You are talking about two completely different packages, with no information on your data, only a small amount of information about your model ("the same analysis") but clearly the analysis is *not* the same or you would get the same results, so really you have "I think I am running the same analysis but either the underlying code/model, the data, or my syntax is actually running a different model and what I really want is someone to help me synchronize the results from R and Stata so I feel more confident, but please do this without data, code, or output".
Please do not take this the wrong way, I am not trying to be harsh, just point out the difficulty of the question you have asked us. I primarily use R, but I work at a consulting center and have access to Stata and some interest in survival models, so if you sent us your data (or found/created some example data that replicated the discrepancy you note), I would try to check out both your R and Stata code, but I can only do this with some help from you. Otherwise, I have to find my own data, examine the functions in R and Stata to compare what they are doing, and try many tests on my own to hopefully try to replicate what you might be seeing and then see if I can actually get the same output. Perhaps a more saintly version of myself would do that, but unlike my officemate, there is no special place waiting for me in heaven, or perhaps I have yet to find my wings. More detailed help provided when you provide a reproducible example as the posting guide requests. Cheers, Josh On Fri, Jul 6, 2012 at 2:12 PM, JPF <xpfen...@gmail.com> wrote: > Dear Community, > > I have been using two types of survival programs to analyse a data set. > > The first one is an R function called aftreg. The second one an STATA > function called streg. > > Both of them include the same analyisis with a weibull distribution. Yet, > results are very different. > > Shouldn't the results be the same? > > Kind regards, > J > > -- > View this message in context: > http://r.789695.n4.nabble.com/differences-between-survival-models-between-STATA-and-R-tp4635670.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html it's this bit right here I am referring to: > and provide commented, minimal, self-contained, reproducible code. --------------------------> ^^^^^^^^^^^^^ -- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, Statistical Consulting Group University of California, Los Angeles https://joshuawiley.com/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.